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jquery.foundation.magellan.js
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jquery.foundation.magellan.js
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/*
* jQuery Foundation Magellan 0.0.1
* http://foundation.zurb.com
* Copyright 2012, ZURB
* Free to use under the MIT license.
* http://www.opensource.org/licenses/mit-license.php
*/
/*jslint unparam: true, browser: true, indent: 2 */
;(
function
(
$
,
window
,
undefined
)
{
'use strict'
;
$
.
fn
.
foundationMagellan
=
function
(
options
)
{
var
$window
=
$
(
window
),
$document
=
$
(
document
),
$fixedMagellan
=
$
(
'[data-magellan-expedition=fixed]'
),
defaults
=
{
threshold
:
(
$fixedMagellan
.
length
)
?
$fixedMagellan
.
outerHeight
(
true
)
:
0
,
activeClass
:
'active'
},
options
=
$
.
extend
({},
defaults
,
options
);
// Indicate we have arrived at a destination
$document
.
on
(
'magellan.arrival'
,
'[data-magellan-arrival]'
,
function
(
e
)
{
var
$destination
=
$
(
this
),
$expedition
=
$destination
.
closest
(
'[data-magellan-expedition]'
),
activeClass
=
$expedition
.
attr
(
'data-magellan-active-class'
)
||
options
.
activeClass
;
$destination
.
closest
(
'[data-magellan-expedition]'
)
.
find
(
'[data-magellan-arrival]'
)
.
not
(
this
)
.
removeClass
(
activeClass
);
$destination
.
addClass
(
activeClass
);
});
// Set starting point as the current destination
var
$expedition
=
$
(
'[data-magellan-expedition]'
);
$expedition
.
find
(
'[data-magellan-arrival]:first'
)
.
addClass
(
$expedition
.
attr
(
'data-magellan-active-class'
)
||
options
.
activeClass
);
// Update fixed position
$fixedMagellan
.
on
(
'magellan.update-position'
,
function
(){
var
$el
=
$
(
this
);
$el
.
data
(
"magellan-fixed-position"
,
""
);
$el
.
data
(
"magellan-top-offset"
,
""
);
})
.
trigger
(
'magellan.update-position'
);
$window
.
on
(
'resize.magellan'
,
function
()
{
$fixedMagellan
.
trigger
(
'magellan.update-position'
);
});
$window
.
on
(
'scroll.magellan'
,
function
()
{
var
windowScrollTop
=
$window
.
scrollTop
();
$fixedMagellan
.
each
(
function
()
{
var
$expedition
=
$
(
this
);
if
(
$expedition
.
data
(
"magellan-top-offset"
)
===
""
)
{
$expedition
.
data
(
"magellan-top-offset"
,
$expedition
.
offset
().
top
);
}
var
fixed_position
=
(
windowScrollTop
+
options
.
threshold
)
>
$expedition
.
data
(
"magellan-top-offset"
);
if
(
$expedition
.
data
(
"magellan-fixed-position"
)
!=
fixed_position
)
{
$expedition
.
data
(
"magellan-fixed-position"
,
fixed_position
);
if
(
fixed_position
)
{
$expedition
.
css
({
position
:
"fixed"
,
top
:
0
});
}
else
{
$expedition
.
css
({
position
:
""
,
top
:
""
});
}
}
});
});
// Determine when a destination has been reached, ah0y!
var
$lastDestination
=
$
(
'[data-magellan-destination]:last'
);
$window
.
on
(
'scroll.magellan'
,
function
(
e
){
var
windowScrollTop
=
$window
.
scrollTop
(),
scrolltopPlusHeight
=
windowScrollTop
+
$window
.
outerHeight
(
true
),
lastDestinationTop
=
Math
.
ceil
(
$lastDestination
.
offset
().
top
);
$
(
'[data-magellan-destination]'
).
each
(
function
(){
var
$destination
=
$
(
this
),
destination_name
=
$destination
.
attr
(
'data-magellan-destination'
),
topOffset
=
$destination
.
offset
().
top
-
windowScrollTop
;
if
(
topOffset
<=
options
.
threshold
)
{
$
(
'[data-magellan-arrival='
+
destination_name
+
']'
).
trigger
(
'magellan.arrival'
);
}
// In large screens we may hit the bottom of the page and dont reach the top of the last magellan-destination, so lets force it
if
(
scrolltopPlusHeight
>=
$document
.
outerHeight
(
true
)
&&
lastDestinationTop
>
windowScrollTop
&&
lastDestinationTop
<
scrolltopPlusHeight
)
{
$
(
'[data-magellan-arrival]:last'
).
trigger
(
'magellan.arrival'
);
}
});
});
};
}(
jQuery
,
this
));
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